Deep-well-boring apparatus.



' J. H. BRMAN &-B. J. WBGBR.

DEEP WELL BORING APPARATUS. APPLICATION FILED D50. 15, 1911.

Patented 1166.3,19112 /NvE/VTORS/ `WlTNEsslss:

MMM

UNTTEE sTATEs PATENT oEEioE.

JOI-IN HENRY HERMAN AND BERNARD JACOB WEGER, OF NAPCEB, NEW ZEALAND.

DEEP-WELL-BORING APPARATUS.

Spec'ication of Letters Patent.

Patented Dee. 3, 1912.

To all whom t may concern:

Be it known that we, JOHN HENRY HER- MAN and BERNARD J AooB- INTEGER, citizens of the United States of America, residing at lYapier, New Zealand, have invented a new and useful Improvement in Deep-Well-.Bor-

ing Apparatus; and we do hereby declare has been designed in order to provide forsuch being sunk with greater ease and expedition than is'at present the case.

`With the appliances at present in use it is customary when borng through different natures of strata to change from the cable to the rotary system of boring and vice versa and in making the change from the rotary to the cable it is required to withdraw an inner tubular casing from the bore and in re-commencing the rotary to replace such casing.

The present invention has been designed to obviate the necessity for using this inner casing and the consequent necessity of its withdrawal and4 replacement when making the changes mentioned, and to utilize the bore casing itself for driving. the rotary drilling head by providing a special construction of drill head that is adapted .to be lowered through the casing and locked within its bottom end and to be withdrawn therefrom at will. The drill head carries the boring bits and means whereby, when the head has been lowered-to the bottom of the casing, the bits will extend below it and be expanded to extend beyond lthe outer periphery of the casing` and thus to bore the necessary clearance for the sinking of the casing. These means 'are also such that when the drill head is raised the bits will be drawn inward radially `so as to lie within the compass of thev head to permit of the head being raised through the casing. Special means are -also provided for lowering the drill head into position, and for raising it when required.

In fully descrlbing the invention, reference will be made to the accompanying sheet of drawings, in which:-

Figure 1 is a front Yelevation of the drill y.head in position wit-h in the bore. casing, which is shownl in section.: Fig. 2 1s a sec-r tional elevation thereof. Fig. 3 is a side elevation, partly in section, of the drill head in position in the casing which is shown in section. Fig. 4 is an underneath plan of the drill head and casing. Fig. 5 is a sectional plan taken on the line 5-5 of Fig. 2 and looking upward from said line. Fig. 6 is a sectional plan taken on the line 6-6 of Fig. 2. Figs. 7 and 8 are longitudinal sections, respectivel on lines at right angles to each other, o the appliance for use in lowering and raising the drill head.

In carrying out the invention the bore casing A 1s made with the usual reinforced lower end having a chisel edge a on its bottom. This lower end is, however, formed with a groove B in its inner periphery, near the bottom and the surface of this groove is made with ratchet teeth or notches B thereon and extending right around it.

The drill head C is formed of a circular block of metal of a size to neatly fit the casing A so that it may pass freely up and down therein. Within small recesses D (Figs. 3 and 5) made to extend inward from the head surface, toothed blocks D are fitted and spring cushioned by the springs d so as to be kept normally projecting beyond the peripheral edge of the drill head. The teeth of these blocks are adapted to engage with the teeth B upon the inside of the casing and thus when the head is lowered through the casing and the blocks reach the position of these teeth, to spring out into engagement therewith and lock the head to rotate with the casing when rotation is imparted to it in one direct-ion by the usual means employed for such purpose. The upper edges of the groove B and of the blocks D are inclined as shown in Fig. 3 in' order that when the drill head is raised, the blocks will be forced back into their recesses land permit of the head sliding up within the casing.

The drill head is formed with a slot extending diametrically through it and within this slot a pair of drilling bits E are pivotally hung on cross pins G to swing radially within the head. These bits are so shaped that when swung inward, their lower ends will overlap each other within the compass of the head'.` The outer edge of each bit is shaped to fit beneath the chisel ed e a of the casm and to extend downward or a suitable istance below such edge.A This portion is also formed with a cutting edge e (Figi 4) and the lower end of the bit is curved upward and inward, as shown in Figs. 1

45 i drawings.

will then impart-,a rotation'to the drill head g and 2, to'forma cutting'point efor the bit;

Each bit isi-also 'formed with teeth Fon its outeredgeadapted toengage with the teeth Bf in the casi-ng whenthe bit is swung outward on its'pivot Gr, and thus also to lock the bitsto revolve with the casing and there.

by to'less'en' the strain upon the cross pins G.

Each bit isiformedfon its inner edge with a y face H inclining v. upward and outward so that the faces `II-of the two bits together :form a wedge shaped opening as shown in p Fig. 2. AprodJ is mounted to slide in a central borein the headV and this rod is provided with a wedge shaped block K on its lowerv end. This block, when the rod is moveddown in the head is adapted to engage ,with the facesH of the` bits and to force the bits apartv so that they will swing outward. The block'K is formed with a shoulder K on itstop andl each bit is provided with a -occupy the upward limltof its movement in the head and'thus keep the bits swung in. The head may thus be raised or lowered inv the casing while suspended on the rod.

' In use, when the head is lowered and thev blocks D reach the level of the groove Bzthe blockswillspring vout and engage with the teeth B andthe further lowering of thel head thereby' be prevented. When -the-headthus stops, the rod J will move down by its own weight causing the block K tor engage with-the inclinedl faces H of the bits and to force the bits out to their operative positions 'as shown by 'the full lines in the The 'rotation of the. casing A and bits'so that the bits will bore the reyuired, hole for the sinking of the casing. 50v

n the withdrawal of the drill head, the raising of the rod will first turn the bits in and w1ll then lift thehead through the cashe means designed for use in lowering 'and raising the -head shown in Figs. 7 and 8 are adapted to lower and release 'the head, or to grip and raise it, as required. ,These means consist of ahollow sleeve N adapted to be suspended from a vcable or the like and to t over a head O formed on the to end of the rod J. The sleeve carries wit in it a pa1r of pawls P pivoted in grooves on its inner sur ace and arranged to extend upward and inward from the pivot points. Eachl of these pawls is connected by means rof the connectingv a rod'S'iiiount-l u ed to slide in thewallo' the sleeve N and closely fitting in itsibore so ras to remain at any position to which itlis moved.- The upward movement of these rods S will thus `cause lthe pawlsP to be drawn outat the1r upperfends.v VVh'en lowering' thel drillliead, the sleeve N is passedl down' over' the rod J .and the pawls P jpositionedftol engagey beneath ,the head O of--such tod. IThe rod and drill head will then be 'suspended-from lthe sleeve and may be lowered... When the head reaches its working position' in the casing,- the sleeve will move-down along tl'ierod J I until the bottomends .of-the. sliding rods S (which are made ofsuch a length asto project beyond the bottom ofthe sleeve.) engage with the drill head. V The weight of 'the sleeve will then cause it to m'ove down and the rods-S to slide upward within it thereby drawing the pawlsl outward .so that when the sleeve is drawn up they will clear the head of the rod kJ and thus'allow for the sleeve passing clear up through-the casing. To raise the drill head, the .pawls P- are first disconnected from the rods S so that they will fall inwardby gravity. The sleeve is then lowered downso that it will pass over the head Olot the rod- J and the pawls slide over and engage beneath such head in order to lift the rod and drill head when the sleeve is withdrawn.

The drill head is formed with the apertures T extending up through it to permit of the escape of water and other liquids from below to above the head as it is being lowered through the casing. When the drill head has been removed, the bore casing may be used in the ordinaryway, for sinking by the cable system.

What we claim as our 'i invention landl desire to secure by Letters Patent is 1. In deep well boring apparatus, the combination with a bore casing formedwith la toothed groove on its inner periphery, of a drill head adapted to b e -lowered through the casing, sprinv controlled blocksk mounted to Slide radialy in the drin head and u engage with the teeth in the casing, boring bits pivotally hung lin the drill head and means whereby such bits may beswung out beyond the compass ofthe head o r swungpin within the compass thereof, substantially as specified.

2. In deep well boring apparatus, the combination with abore casing, of a` drill head adapted to pass through the casing and having means for locking with. the casing, a suspension rod fitting axially in the drill head andcap'able of limited longitudinal movement therein, boring bits pivotall hung in the drill head and each formedwit an inwardly inclinedface on the lower porf tion of its lnner edge and with an inwardly Aextending tooth .at the upper portion of such edge, and a wedge shaped block upon the bottom end of the suspension rod situated between the inclined faces and the teeth upon the bits, substantially as herein specified.

3. In deep well boring apparatus, a drill head adapted to pass into the bore casing and to be locked thereto, a suspension rod arranged axially in the drill head and capable of limited longitudinal movement therein, and boring bits carried in the drill head and adapted to be swung out beyond the compass thereof by the downward movement of the suspension rod and to be swung in within its compass by the upward movement of the suspension rod, substantially as herein specified.

il. In deep well boring apparatus, a drill head adapted to pass into the bore casing and to be locked thereto and carrying boring bits pivotally suspended therein, a longitudinally movable sus ension rod arranged axially in the drlll head, a head upon the upper end of such rod, means on the lower end of said rod adapted as the rod is moved downward to engage and ytorce outward said bits, a sleeve adapted to .be passed down the bore casing and to encircle the top end of the suspension rod, said sleeve having a portion adapted to engage the head of said rod and force it downward, pawls pivoted within the sleeve andadapted to engage beneath the head on the rod, sliding rods mounted longitudinally with the sleeve and connections between the sliding rods and the pawls, said sliding rods being adapted to engage said drill head to remove said pawls out of engagement with said head whenv said slve has forced said suspension rod downward substantially as herein specified.

In testimony whereof, we have signed this specification in the presence of two subscribing witnesses.

JOHN HENRY HERMAN. BERNARD IACGB WEGER.

Witnesses:

W. ALEXANDER, M E. BROWN. 

